If some casinos offer even small surcharges or just bonuses to some author of a gambling review site, such an author will still agree to post positive information about this casino. But there is also the opposite - some kind of casino can also order anti-advertising of competitors. And also for money. As a result, all information will be so distorted that it will not correspond to the objective picture of events in the casino world at all. So none of the gambling review sites can be trusted.